If one surface slides over the other, being pressed together by a normal force N, a frictional force F resisting the motion must be overcome. The ratio F/N is called ______________

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1.	If one surface slides over the other, being pressed together by a normal force N, a frictional force F resisting the motion must be overcome. The ratio F/N is called ______________
A.	kinetic friction
B.	dry friction
C.	friction circle
D.	none of the mentioned
Answer» B. dry friction

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